Reversing-valve for steam-engines



(No Model.)

3 P. M. (moss.

REVERSING VALVE FOR STEAM ENGINES.

Patented May 17, 1887 N. PETERS, Phnta-ljlhngfipher, Washington. :2. c.

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Nirn STATES PETER M. GROSS, OF PHILLIPS, ASSIGNOR OF ONE-HALF TO SPANOGLE 8t 00., OF AURORA, NEBRASKA.

REVERSING-VALVEFOR STEAM-ENGlNES.

SPECIFICATION forming part of Letters Patent No. 363,318, dated May 17, 1887.

Application filed January 15, 1887. Serial No. 224,388. (No model.)

To all whom it may concern:

Be it known that I, PETER M. ORoss, a residentof Phillips, inthe county ofHamilton and State of N cbraska, have invented certain new and useful Improvements in Reversing-Valves for Steam-Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains [O to make and use the same.

My invention relates particularly to means for reversing steam-engines, which is accomplished by means of two independent slidevalves for admitting steam to the cylinder 1 through the same ports, and a third valve adapted to shut off from said ports the steam passing either slide-valve.

In the drawings, to which this specification refers by letters, Figure l is a plan of a portion of an engine provided with my devices. Fig. 2 is a side elevation of the same parts. Fig. 3 is the side of the steam-cylinder, showing the ports exposed by removing the valvebox. Figs. 4c and 5 show, respectively, the

2 outer and the inner sides of the valve-box.

, Figs. 6 and 7 are respectively sections on the lines to y and a2 3 of Fig. 2.

The drawings show an ordinary cylinder, B, mounted upon a bed, A, and providedwith 0 the usual piston, piston-rod D, and ports K, Fig. 3. The valvebox O is chambered upon its outer surface at N, Figs. 4, 6, 7, for the reception of two distinct slide-valves, V V. From this chamber four passages, P P P P,

3 5 lead through the valve-box,whose opposite or inner face is shown in Fig. 5, to the ports K of Figs. 3, 6, 7. Between the passages P P, and also between the passages l? P, are recesses communicating with an exhaust-pipe,

F, Figs. 1 and 2. The slide-valves are chambered, so that either in uncovering one of its ports connects the other with the exhaust-pipe byway of the recesses Q, Q and passage R. They are actuated by eccentrics (not shown) in the usual manner and act alternately, Figs. 6 and 7 showing their relative position at one instant. Evidently were no other devices employed they would, in the position shown, connect each of the ports K withboth induction and eduction pipes. A valve, T, however,

seated in the rear face of the valve-box 0, according to its position, shuts off all communi cation between the passages P or the passages P and the ports K. The length of this valve is such that when thrown to either end of its path it uncovers one of the outer or end passages. while at the same time by means of a central opening, S, one only of the central passages is left unobstructed. It follows that with this valve at either end of its path one of the slide- 6 valves is entirely without effect as to the passing of either live or exhaust steam, and that simply sliding this valve renders the idle slidevalve effective and makes the other an idler, reversing the engine. It is plain that the en 6 gine is reversed, for since the valves act alternately the port which was before connected with the exhaust now receives live steam, and vice versa.

The construction of the slide-=valvcs may be varied within certain obvious limits, and most of the advantages of the best forms of valves be secured-c. 9., steam may be cut off at any point and the stroke may be cushioned. The valve T is shown with a jointed valve-stem connected to a lever, I, pivotally attached at J to the bed of the engine; but any suitable means may be substituted for the purpose of sliding the valve and holding it in the desired position.

I am aware that it has been proposed to provide the cylinder of an engine with two reeip rocating valves, and to combine with said valves means for separating either of them from the ports of the cylinder. Said proposed 8 5 construction was, however, materially different from the one forming the subject of this application; and whileIdo not claim, broadly, such a construction as I have outlined I believe the differences between said prior form go and the one shown and described herein to be material and valuable, and such differences and improvements are set out in the following claims, to wit:

1. The combination, with the cylinder pro- 5 vided with ports for the admission of steam to its ends, of a valve-chest covering said ports and formed with external and internal chambers separated by a stationary partition, two valves reciprocating alternately in said ex- 1'00 ternal chamber, two independent sets of ports leading from said external chamber through said partition to said internal chamber, and adapted to be. opened and closedby the reciprocation of said valves, respectively, and an adjustable cut-off plate seated in said internal chamber, and adapted when in one position to close one of the sets of ports in said partition, and when in another position to close the other of said sets of ports. I

2. The combination, with the cylinder of an I engine provided with ports for the admission of steam to its ends, of a valve-chest covering said ports and formed with an internal and an external chamber separated by a stationary partition, two valves reciprocating in said external chamber, independent ports leading from said internal to said external chamber through said partition, and adapted to be opened and closed by the reciprocation of said valves, respectively, and an adjustable out-off seated in said internal chamber and adapted to close either of the independent ports in said 3. The combination, with the cylinder formed with the ports K K, of a valve-chest covering said ports and formed with the internal and external chambers shown and described, ports P P l? 1 connecting said internal and external chambers, the alternately-reciprocating' valves VV, adapted to open and close the ports P 1?, respectively, and the cutoff plate T, set in said inner chamber and provided with the central opening, S, said cut-oft plate being adapted when in one position to close the ports 1? P, and when in an opposite position to close the ports 1? P, substantial] y as and-for the purpose set forth.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses. 1

PETER M. CROSS.

Witnesses:

A. W. Mason, A. J. SPANOGLE. 

